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annotate libtwamr/enc_main.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 4c9222d95647
children
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2a094af3d384 libtwamr: implement encoder top level
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1 /*
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2 * This C module is the top level entity for our stateful encoder engine.
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3 */
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4
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5 #include <stdint.h>
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6 #include <stdlib.h>
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7 #include "tw_amr.h"
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8 #include "namespace.h"
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9 #include "typedef.h"
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10 #include "cnst.h"
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11 #include "cod_amr.h"
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12 #include "pre_proc.h"
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13 #include "sid_sync.h"
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14 #include "e_homing.h"
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15
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16 struct amr_encoder_state {
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17 cod_amrState cod;
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18 Pre_ProcessState pre;
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19 sid_syncState sid;
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20 };
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21
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22 struct amr_encoder_state *amr_encoder_create(int dtx, int use_vad2)
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23 {
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24 struct amr_encoder_state *st;
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25
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26 st = malloc(sizeof(struct amr_encoder_state));
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27 if (st)
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28 amr_encoder_reset(st, dtx, use_vad2);
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29 return st;
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30 }
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31
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32 void amr_encoder_reset(struct amr_encoder_state *st, int dtx, int use_vad2)
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33 {
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34 cod_amr_reset(&st->cod, dtx, use_vad2);
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35 Pre_Process_reset(&st->pre);
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36 sid_sync_reset(&st->sid);
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37 }
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38
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39 void amr_encode_frame(struct amr_encoder_state *st, enum Mode mode,
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40 const int16_t *pcm, struct amr_param_frame *frame)
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41 {
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42 Word16 new_speech[L_FRAME], syn[L_FRAME];
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43 enum Mode used_mode;
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44 enum TXFrameType tx_type;
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45 Word16 i;
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46
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47 /* input */
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48 for (i = 0; i < L_FRAME; i++)
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49 new_speech[i] = pcm[i] & 0xFFF8;
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50 Pre_Process(&st->pre, new_speech, L_FRAME);
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51
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52 /* main process */
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53 cod_amr(&st->cod, mode, new_speech, frame->param, &used_mode, syn);
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54 sid_sync(&st->sid, used_mode, &tx_type);
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55 frame->type = tx_type;
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56 frame->mode = mode;
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57
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58 /* encoder homing */
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59 if (encoder_homing_frame_test(pcm))
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60 amr_encoder_reset(st, st->cod.dtx, st->cod.vadSt.use_vad2);
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61 }